Ch. 12 The Central Nervous System

Amerman - Human Anatomy & Physiology 2nd Edition

Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook

Amerman 2nd Edition

Ch. 12 The Central Nervous System

Problem L2.3

Chapter 12, Problem L2.3

Why must a cell body be intact for an axon to regenerate? (Hint: What structure is housed only in the cell body, and what are its functions?)

Verified step by step guidance

Understand that the cell body of a neuron contains the nucleus, which houses the genetic material (DNA) necessary for the production of proteins and enzymes.

Recognize that the nucleus is responsible for directing the synthesis of essential proteins, including those required for axonal repair and regeneration.

Note that the cell body also contains organelles such as the rough endoplasmic reticulum (Nissl bodies), which are critical for protein synthesis. These proteins are transported down the axon to support its structure and function.

Realize that if the cell body is damaged or destroyed, the neuron loses its ability to produce the proteins and enzymes required for axonal repair, making regeneration impossible.

Conclude that the intact cell body is essential for axonal regeneration because it serves as the metabolic and synthetic center of the neuron, providing the resources needed for repair and growth.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Cell Body Structure

The cell body, or soma, contains the nucleus and essential organelles that support the neuron's functions. It is responsible for maintaining the cell's health and synthesizing proteins necessary for the growth and repair of the neuron, including those needed for axon regeneration.

Nucleus Function

The nucleus houses the cell's genetic material and is crucial for regulating gene expression. In the context of axon regeneration, the nucleus produces the proteins and signaling molecules required for the repair processes, making it vital for the regeneration of the axon.

Regeneration Mechanism

Axon regeneration involves a series of biological processes that include the growth of new axonal sprouts and the re-establishment of connections with target cells. This process is heavily reliant on the resources and signals provided by the intact cell body, which orchestrates the necessary cellular responses for successful regeneration.

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Related Practice

Textbook Question

Mark the following statements about the brain as true or false. If a statement is false, correct it to make a true statement.

The four main components of the brain are the cerebrum, the diencephalon, the cerebellum, and the brainstem.

Textbook Question

The central nervous system is responsible for:

a. Integrative functions

b. Sensory functions

c. Motor functions

d. Both b and c are correct

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Textbook Question

Huntington's disease is characterized by a loss of normal inhibition mediated by the basal nuclei. Predict the symptoms you are likely to see with this disease.

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Textbook Question

Mark the following statements about the brain as true or false. If a statement is false, correct it to make a true statement.

Humans use only 10% of their brains.

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Textbook Question

How could you tell the difference between an injury that damaged the cerebellum and one that damaged the basal nuclei?

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Textbook Question

Why do injuries to the hippocampus interfere with the formation of new declarative memories but do not impact memories already encoded in long-term memory? Why do such injuries not affect the formation of nondeclarative memories?

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